Question 1066193
p = 4c
2p = 6c+6000 substitute for p:
2(4c) = 6c+6,000
8c = 6c+6,000
2c = 6,000
c = 3,000
so the cars cost 3,000 each.
And the planes, the problem says p = 4c, thus p = 4(3,000), p = 12,000 each plane costs 12,000